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4K Ultra HD (UHD) and High Dynamic Range (HDR) on Xfinity TV
Enhanced 4K on Xfinity: What’s New and How to Watch
X1 TV Box equipment types - Xfinity Support
Video settings on Comcast cable Box to view 4K UHD content
ANSWERED: Side by side Xfinity X1 TV Box Comparison - DVR vs.
Upgrade to a 4 k cable box | Xfinity Community Forum
Xfinity X1 Review | Cost, Features, & More | CableTV.com
Comcast To Launch 4K Ultra High-Definition Set-Top Box
Comcast Xfinity X1 DVR Review
Xfinity TV and Internet Equipment Guide: Order, Upgrade, & More